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Back to my tube days. If we picked up a burn on an I/O we would point it at a white card and manually iris up and try to burn out the spot by basically burning the whole surface.
As tubes do not have pixels per se, the white dots may be defects in the tube. Black spots are probably dirt somewhere perhaps, the tube face if you can get to it.
The blotches are misadjustments in the camera. Sort of like shading adjustments in older broadcast cameras. You need a schematic for this problem.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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